Europium-activated alkaline earth fluorohalide x-ray phosphors and method for preparing the same
US4100101A · kind A · utility
8Cited by
2References
6Claims
0Family size
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Key dates
| Filing date | Jun 21, 1976 |
| Grant date | Jul 11, 1978 |
| Priority date | — |
| Expiry date | Jun 21, 1996 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K11/7733
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
In europium-activated alkaline earth fluorohalide x-ray phosphors, the brightness is improved by having a detectable amount of the europium activator in the trivalent state. This beneficial effect is achieved by using a non-reducing firing atmosphere during synthesis for a sufficient time to produce an amount of trivalent europium that is detectable by exciting a sample of the phosphor after firing with 254 nanometer excitation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.